.col-center-block{
    float: none;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

#addSentence .form-group.sentence input.file{
    max-width: 200px;
}

#addSentence .form-group.sentence input.sentences{
    margin-top: 8px;
    margin-bottom: 8px;
}

#addSentence .form-group.sentence input.file{
    opacity: 0;
}

.a-upload {
    padding: 4px 10px;
    height: 30px;
    min-width: 200px;
    line-height: 20px;
    position: relative;
    cursor: pointer;!important;
    overflow: hidden;
    display: inline-block;
    *display: inline;
    *zoom: 1
}

.a-upload  input {
    position: absolute;
    font-size: 100px;
    right: 0;
    top: 0;
    opacity: 0;
    filter: alpha(opacity=0);
    cursor: pointer;!important;
}